The Islamic State of Iraq has been pouring over the Syrian border for some time now in an attempt to bolster Jabhat al-Nusra and topple the Bashar Al-Assad regime. They're best known for fighting the U.S. Marines in Iraq's western-most Al-Anbar province during the Iraq War.

Their soft-side approach in Syria mimics that of a letter written by the head of Al Qaeda in the Arabic Peninsula in 2012, Nasser al-Wahishi. The letter — sent to Qaeda's leaders and a copy of which Associated Press reporters found in Mali — encouraged water works and electricity projects, rather than Islamic summary maimings.

It even gave advice on how to best conduct trash pick-ups.

"Try to win them over through the conveniences of life, it will make them sympathize with us and make them feel that their fate is tied to ours," wrote Wahishi.